import java.sql.*;

public class Main {
    public static void main(String[] args) {
        Connection connection =null;
        PreparedStatement preparedStatement =null;
        ResultSet resultSet =null;
//1.加载驱动
        try {
            Class.forName("com.mysql.cj.jdbc.Driver");
            //2.创建连接
            String url="jdbc:mysql://127.0.0.1:3306/jdbc?characterEncoding=utf-8";
             connection = DriverManager.getConnection(url, "root", "root");
            /*if(connection!=null){
                System.out.println("连接成功");
            }*/
            //3.写sql
            String sql="select*from user";
            //4.预编译sql
            preparedStatement = connection.prepareStatement(sql);

            //5.执行sql
            resultSet = preparedStatement.executeQuery();
            //6.遍历结果
            while(resultSet.next()) {
                int id = resultSet.getInt(1);
                String name = resultSet.getString(2);
                String pass = resultSet.getString(3);
                System.out.println(id + "----" + name + "----" + pass);
            }





        } catch (ClassNotFoundException e) {
            throw new RuntimeException(e);
        } catch (SQLException e) {
            throw new RuntimeException(e);
        }finally{
            //7.关闭资源
            try {
                if (resultSet!=null) {
                    resultSet.close();
                }
                if (preparedStatement!=null) {
                    preparedStatement.close();
                }
                if (connection!=null) {
                    connection.close();
                }
            } catch (SQLException e) {
                throw new RuntimeException(e);
            }

        }
    }
    }
